Static suction apparatus



June 23, 1931. LEJAY 1,811,323

STATIC SUCTION APPARATUS Filed larch 18, 1929 Lil Patented June 23, 1931 PATENT $FFlE RAYMOND LEJ'AY, OF VINCENNES, FRANCE STATIC SUCTION APPARATUS Application filed. March 18, 1929, Serial No. 348,103, and in France March 30, 1928.

The present invention relates to suction devices.

Numerous types of suction devices have already been provided, particularly for improving the draught of chimneys or for the aeration of premises, these devices entering in action when they are struck by atmospheric air currents. These devices or apparatus are particularly eflicient when they are struck by atmospheric air currents the general direction of which isperpendicular to the displacement of the sucked fluid. This is not the case when the atmospheric currents are distinctly oblique relatively to the direction of displacement of the sucked air, that is to say, in practice, oblique relatively to the general axis of the draught conduit for the sucked fluid. In the case of distinctly oblique and downwardly moving currents, re-entrances of air usually take place in. the draught conduit for the sucked fluid.

The invention is adapted to remedy, by extremely simple means, the above mentioned inconveniences and, for that purpose has for an object to provide suction apparatus characterized by the combination, with one or more draught conduits for the sucked fluid, of at least one enclosure the directrix of which is a polygonal line or a closed curve and the generating line a broken line or a curve the convexity of which is turned outwardly, this enclosure being open at least at its upper and lower parts.

In the accompanying drawings Fig. 1 is a side elevation of the device, partly in section.

Fig. 2 is a sectional view of a modified form of the invention, the conduit being shown in elevation.

Fig. 8 is a sectional view of another modified form of the invention.

Fig. 4 is a similar view of still another modified form of the invention.

In the example illustrated in Fig. 1, the enclosure 1 has a curvature similar to a parabola and is substantially constituted by a spherical zone the parallel secant planes of which are located on either side of the )0 center of the sphere, or the generating line can be an arc of circle the center of which is not on the axis of generation A-A.

Such an enclosure can be made of any suitable material: sheet-iron, cast metal, ceramics, cement, etc. It fits on a draught conduit 2 for the sucked fluid and is secured thereon by tongues 3 providing between. them ports 4 giving access to the interior of the enclosure 1, said enclosure having an open upper end. The draught conduit 2 opens within the enclosure 1 inv the form of a conical nozzle the external part of which is adapted to flt on draught conduits and to be secured on the said draught conduits (chimneys or aeration pipes already exist ing). The maximum curvature of the enclosure 1 is above the ports 4.

Figure 2 shows an aeration apparatus the enclosure 1 of which is provided, at its lower part, with a skirt 1 having a rectilinear generating line or a curvature opposed to that of the generating line of the enclosure 1 proper. This arrangement allows to increase, in the case of currents of air horizontally directed, the depression in the neighborhood of the ports 4.

In the modified form shown in Fig. 8, the enclosure 1 is provided with a deflector 10 the shape of which can, substantially, be that of a conical member the point of which is directed upwardly and supported relatively to the enclosure 1 by means of narrow arms 11. This conical member can be of reduced dimensions and constitutes a negligible obstacle for the ascending currents coming from the draught conduit 2.

In case of an absolutely plunging wind, the small air streams are thrown back in the direction of the arrows, providing a central draught zone and the mixture formed of driving wind and sucked fluid is evacuated through the ports 4.

The effects of the deflector can, moreover, be easily increased, without creating any appreciable obstruction to the rising of the sucked fluid, in the case of oblique or horizontal currents. For that purpose, it is possible to have recourse to the modification shown in Fig. 4, and in which the deflector is divided in at least two parts, an upper part or point 10, and one or more lower rings 12 suitably supported relatively to the enclosure, as Well as the point 10, by means of. arms 11 as narrow as possible. The respective directions of the streams of the driving and sucked fluids, are indicated by the arrows in the case of an absolutely plunging driving current. i

The application of the suction apparatus forming the subject-matter of the invention is, obviously, not limited'tochimneys for the evacuation of smoke, or to conduits for the aeration of premises. The use ofthese suction apparatus is more generally suited to cases in which it is required to ensure the suctionof a fluid by utilizing thenatural or forced displacement of another fluid.

WhatI claim as my invention and desire V to secure by Letters Patents is:

1. In a suction apparatus of the, type-described, an ovoid enclosure the generatrix of which has a curve increasing from its; free edge to the fixed part on the suction conduit, deflectors disposed internally ofthe said enclosure for resisting. the admission of a p plunging wind in the suction conduit,

' tongues on the part with'maximum curvatureand forming openings between them, and meansfor fixing the free ends: of. the said tongues on the suction conduit.

2. In a suction device comprising an ovoid enclosure body, open at its-lower and; upper ends, disposed coaxially relativetothe end of a suction conduit, tongues on the enclosure inxth'e zone of the maximumcurvaturethereof, the generatrix of the enclosure having; a curvature increasing from its upper. end to the tongues, and'meansfor securing the tongues to the conduit. 7

3. In a suction device: comprising: anovoid enclosure, the generatrix of which: has a curve increasing from its free end, a deflector disposed interiorly of the enclosure for re sisting the admission of'a plunging: windin a suction conduit, tongues: on the enclosure inthe zone of its maximumnurvature and forming ports between them, means forfixingthefree ends of the'tongues on the suction conduit, at points below the uppenedge thereof, the portionof the conduit, extend?- ing abovesaid points constituting-a wall in front of said ports for preventing them from being struck directly by the wind.

In testimony whereof I have: signed my name to'this specification.

I v RAYMOND LEJAY. 

